[Moved] A problem : pic16f877a with servo motor

[Ibrahim El Ayas]

Alsalamo Alykom

hi

i want to make a servo motor rotates by an angle
the PWM code is

while (1)
{
          portc.f0=1;

         delay_us(2000);

          portc.f0=0;
        delay_us(18000);

}

you must change these values to gain an angle

i want to know for 1 degree how much Hi period does it take ...

Thank you ...

 

[enjunear]

Re: A problem : pic16f877a with servo motor

Look at the specs for your servo. The manufacturer should give you information regarding max/min pulse widths for max/min angles of rotation.

 

[Ibrahim El Ayas]

thanks enjunear for your help

but my problem is that the delay function did not work .. i am thinking about timers ...

 

[cubanflyer]

What you need to do is take the normal rotation of a servo which is 180 degree.

Now take the pulse width for the rotation which is normally 1ms. ( the 2 ends are 1ms and 2ms).

So from the 1ms position to move 1 degree the pulse needs to (1*(1/180))+1ms = 1.006ms approx (1006us).

These calcs are based on a normal RC servo.

HTH